EP1590387B1 - Initiateurs d'azlactone a cycle ouvert pour polymerisation radicalaire a mediation par nitroxyde - Google Patents

Initiateurs d'azlactone a cycle ouvert pour polymerisation radicalaire a mediation par nitroxyde Download PDF

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EP1590387B1
EP1590387B1 EP04702949A EP04702949A EP1590387B1 EP 1590387 B1 EP1590387 B1 EP 1590387B1 EP 04702949 A EP04702949 A EP 04702949A EP 04702949 A EP04702949 A EP 04702949A EP 1590387 B1 EP1590387 B1 EP 1590387B1
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group
arenyl
alkyl
initiator
cycloalkyl
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EP1590387A1 (fr
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Duane D Fansler
Kevin M. Lewandowski
Michael S. Wendland
Babu N. Gaddam
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3M Innovative Properties Co
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3M Innovative Properties Co
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F4/00—Polymerisation catalysts
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F293/00—Macromolecular compounds obtained by polymerisation on to a macromolecule having groups capable of inducing the formation of new polymer chains bound exclusively at one or both ends of the starting macromolecule
    • C08F293/005—Macromolecular compounds obtained by polymerisation on to a macromolecule having groups capable of inducing the formation of new polymer chains bound exclusively at one or both ends of the starting macromolecule using free radical "living" or "controlled" polymerisation, e.g. using a complexing agent
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2438/00—Living radical polymerisation
    • C08F2438/02—Stable Free Radical Polymerisation [SFRP]; Nitroxide Mediated Polymerisation [NMP] for, e.g. using 2,2,6,6-tetramethylpiperidine-1-oxyl [TEMPO]

Definitions

  • the present invention provides initiators for nitroxide-mediated radical polymerization (NMP) processes.
  • radical polymerization processes the polymerization terminates when reactive intermediates are destroyed or rendered inactive; radical generation is essentially irreversible. It is often difficult to control the molecular weight and the polydispersity (molecular weight distribution) of polymers produced by conventional radical polymerization, in order to achieve a highly uniform and well-defined product. It is also often difficult to control radical polymerization processes with the degree of certainty necessary in specialized applications, such as in the preparation of end functional polymers, block copolymers, star (co)polymers, and other novel topologies.
  • radicals are generated reversibly, and irreversible chain transfer and chain termination are absent.
  • ATRP atom transfer radical polymerization
  • RAFT reversible addition-fragmentation chain transfer
  • NMP nitroxide-mediated polymerization
  • iniferters each method having advantages and disadvantages.
  • NMP Nitroxide mediated radical polymerization
  • radical polymerization process which provides telechelic (co)polymers having a predictable molecular weight and a narrow molecular weight distribution (low “polydispersity").
  • a further need is for a radical polymerization process which is sufficiently flexible to provide a wide variety of products, but which can be controlled to the degree necessary to provide highly uniform products with a controlled structure (i.e., controllable topology, composition, etc.).
  • a controlled radical polymerization process which provides telechelic (co)polymers capable of entering into further polymerization or functionalization through reactive end-groups, particularly electrophilic end groups.
  • the present invention discloses initiators for nitroxide-mediated radical polymerization processes that comprise compounds of the Formula I:
  • the present invention also provides initiators that comprise the ring-opened reaction product of the initiators of Formula I and a reactive compound, such as an aliphatic compound, having one or more nucleophilic groups.
  • a reactive compound such as an aliphatic compound, having one or more nucleophilic groups.
  • Such initiators have the general Formula II: wherein
  • the initiators of the present invention provide (co)polymers having a predictable molecular weight and a narrow molecular weight distribution.
  • the initiators provide novel multireactive addition polymers having first and second terminal reactive groups that may be used for further functionalization.
  • the present invention further provides a controlled radical polymerization process useful in the preparation of terminal-functionalized (telechelic) (co)polymers, block copolymers, star (co)polymers, graft copolymers, and comb copolymers. The process provides these (co)polymers with controlled topologies and compositions.
  • control over molecular weight and functionality obtained in this invention allows one to synthesize numerous materials with many novel topologies for applications in coatings, surface modifications, elastomers, sealants, lubricants, pigments, personal care compositions, composites, inks, adhesives, water treatment materials, hydrogels, imaging materials, telechelic materials and the like.
  • the invention provides a method for polymerization of one or more olefinically unsaturated monomers comprising addition polymerizing one or more olefinically unsaturated monomers using the ring-opened azlactone initiators of Formula II.
  • alkyl refers to straight or branched, cyclic or acyclic hydrocarbon radicals, such as methyl, ethyl, propyl, butyl, octyl, isopropyl, tert-butyl, sec-pentyl, cyclohexyl, and the like.
  • Alkyl groups include, for example, 1 to 18 carbon atoms, preferably 1 to 12 carbon atoms, or most preferably 1 to 6 carbon atoms.
  • aryl means the monovalent residue remaining after removal of one hydrogen atom from an aromatic compound which can consist of one ring or two fused rings having 6 to 12 carbon atoms.
  • arenyl means the monovalent residue remaining after removal of a hydrogen atom from the alkyl portion of a hydrocarbon containing both alkyl and aryl groups having 6 to 26 atoms.
  • azlactone means 2-oxazolin-5-one groups and 2-oxazolin-6-one groups of Formula I, where n is 0 and 1, respectively.
  • heterocyclic group or “heterocycle” means the monovalent residue remaining after removal of one hydrogen atom from an cycloaliphatic or aromatic compound having one ring or two fused rings having 5 to 12 ring atoms and 1 to 3 heteroatoms selected from S, N, and nonperoxidic O.
  • Useful heterocycles include azlactonyl, pyrrolyl, furan, thiophenyl, imidazolyl, pyrazolyl, thiazolyl, oxazolyl, pyridinyl, piperazinyl, piperidinyl, hydrogenated and partially hydrogenated derivatives thereof
  • multifunctional means the presence of more than one of the same functional reactive group
  • multireactive means the presence of two or more of two different functional reactive groups
  • polyfunctional is inclusive of multireactive and multifunctional.
  • molecular weight means number average molecular weight (M n ), unless otherwise specified.
  • (co)polymer refers to homo- and copolymers.
  • (meth)acrylate refers to both methacrylate and acrylate.
  • the present invention discloses novel initiators of Formula I and provides the corresponding ring-opened initiators of Formula II for controlled radical polymerization processes.
  • the organonitroxide moiety, -ON(R 2 ) 2 may comprise the residue of any hindered organonitroxide which, on exposure to thermal energy; homolytically cleaves at the C-O bond to form a radical.
  • the hindered organonitroxide moieties are of the general formula: wherein
  • Useful organonitroxides include:
  • Initiators of Formula I may be prepared using the generalized schemes as shown, where "Az” refers to the pendent azlactone moiety of Formula I and where structural details have been eliminated for clarity.
  • a vinyl azlactone is first treated with a free-radical initiator to form the transient azlactone radical shown.
  • This radical may be captured by an organonitroxide of the formula ON(R 2 ) 2 (previously described), or may oligomerize with additional vinyl azlactone to produce an oligomeric radical having a plurality of pendant azlactone groups.
  • This oligomeric radical may then be captured by the organonitroxide to form an oligomeric initiator of Formula I, where (with reference to Formula I) X is the residue of a free radical initiator, m is 1 to 20, and q for the (CH 2 ) q adjacent to the X group is 1.
  • the degree of oligomerization depends on the substitution of the olefinic bond. With reference to formula I, those compounds where R 1 is H oligomerize readily, however where R 1 is an alkyl group, the compounds oligomerize less readily. As in any conventional oligomerization process, the products will comprise a range of molecular weights and degrees of oligomerization. Thus the value m may be a non-integral value, reflecting the average degree of oligomerization of the product.
  • any conventional free radical initiator including photo- and thermal initiators may be used to generate the initial azlactone radical.
  • the degree of oligomerization can be controlled by the amount of initiator, the temperature and concentration.
  • the initiator is a photoinitiator and is capable of being activated by UV radiation, e.g., at wavelengths from.about 250 nm to about 450 nm, more preferably at about 351 nm.
  • Useful photoinitiators include e.g., benzoin ethers such as benzoin methyl ether and benzoin isopropyl ether, substituted benzoin ethers, substituted acetophenones such as 2,2-dimethoxy-2-phenylacetophenone, and substituted alpha- ketols.
  • photoinitiators examples include IrgacureTM 819 and DarocurTM 1173 (both available form Ciba- Geigy Corp., Hawthorne, NY), Lucern TPOTM (available from BASF, Parsippany, NJ) and IrgacureTM 651, (2,2-dimethoxy- 1,2-diphenyl-1-ethanone) which is available from Ciba-Geigy corporation.
  • thermal initiators examples include peroxides such as benzoyl peroxide, dibenzoyl peroxide, dilauryl peroxide, cyclohexane peroxide, methyl ethyl ketone peroxide, hydroperoxides, e.g., tert-butyl hydroperoxide and cumene hydroperoxide, dicyclohexyl peroxydicarbonate, 2,2,-azo- bis(isobutyronitrile), and t- butyl perbenzoate.
  • peroxides such as benzoyl peroxide, dibenzoyl peroxide, dilauryl peroxide, cyclohexane peroxide, methyl ethyl ketone peroxide
  • hydroperoxides e.g., tert-butyl hydroperoxide and cumene hydroperoxide
  • dicyclohexyl peroxydicarbonate 2,2,-azo- bis(isobutyronitrile
  • thermal initiators examples include initiators available from DuPont Specialty Chemical (Wilmington, DE) under the VAZO trade designation including VAZOTM 64 (2,2'-azo- bis(isobutyronitrile)) and VAZOTM 52, and LucidolTM 70 from Elf Atochem North America, Philadelphia, PA.
  • the initiator is used in an amount effective to facilitate oligomerization of the vinyl azlactone and the amount will vary depending upon, e.g., the type of initiator, and the molecular weight of the vinyl azlactone.
  • the initiators can be used in amounts from about 0.001 part by weight to about 1 parts by weight based on 100 parts vinyl azlactone.
  • a halogen-substituted azlactone is treated with a dithiocarbamate salt to displace the halide (Hal) to form the depicted dithiocarbamate-substituted azlactone.
  • This may be treated with light energy in the presence of an organonitroxide to generate the transient azlactone radical, which is captured by the organonitroxide to produce a monomeric initiator where, with reference to Formula I, q is 0, and X is an H, an alkyl group, a cycloalkyl group, a heterocyclic group, an arenyl group, an aryl group, a nitrile, or an acyl group.
  • Useful azlactone initiators include the following compounds:
  • Ring-opened azlactone compounds of Formula II may be made by nucleophilic addition of a compound of the formula R 5 (ZH) p to the azlactone carbonyl of Formula I as shown below.
  • R 5 is an inorganic or organic group of valence p, having one or a plurality of nucleophilic -ZH groups that are capable of reacting with the azlactone moiety of Formula I.
  • R 5 (ZH) p may be water.
  • R 1 , R 3 to R 5 , ON(R 2 ) 2 , X, Q, Z, n, q and p are as defined in Formulas I and II. For simplicity, the repeat unit of the oligomerized initiators is not shown.
  • R 5 may be a polymeric or non-polymeric organic group that has a valence of p and is the residue of a nucleophilic group-substituted compound, R 5 (ZH) p , in which Z is -O-, -S-, or -NR 6 wherein R 6 can be a H, an alkyl, a cycloalkyl or aryl, a heterocyclic group, an arenyl and p is at least one, preferably at least 2.
  • the organic moiety R has a molecular weight up to 20,000, preferably selected from mono- and polyvalent hydrocarbyl (i.e., aliphatic and aryl compounds having 1 to 30 carbon atoms and optionally zero to four catenary heteroatoms of oxygen, nitrogen or sulfur), polyolefin, polyoxyalkylene, polyester, polyolefin, polyacrylate, or polysiloxane backbones.
  • R 5 may comprise metal- or nonmetal oxides such as silica, alumina or glass having one or a plurality of -ZH groups on the surface.
  • R 5 comprises a non-polymeric aliphatic, cycloaliphatic, aromatic or alkyl-substituted aromatic moiety having from 1 to 30 carbon atoms.
  • R 5 comprises a polyoxyalkylene, polyester, polyolefin, polyacrylate, or polysiloxane polymer having pendent or terminal reactive -ZH groups.
  • Useful polymers include, for example, hydroxyl, thiol or amino terminated polyethylenes or polypropylenes, hydroxyl, thiol or amino terminated poly(alkylene oxides) and polyacylates having pendant reactive functional groups, such as hydroxyethyl acrylate polymers and copolymers.
  • a catalyst may be added to effect the condensation reaction. Normally, primary amine groups do not require catalysts to achieve an effective rate of condensation with the azlactone group of Formula I. Acid catalysts such as trifluoroacetic, ethanesulfonic, and toluenesulfonic acids are effective catalysts with hydroxyl groups and secondary amines.
  • p is at least one, but preferably p is at least two.
  • the multiple -ZH groups of the polyfunctional compound may be the same or different.
  • Multifunctional compounds may be reacted with the azlactone compound of Formula I to produce polyfunctional initiators of Formula II, where p is at least two.
  • Such polyfunctional initiators allow the preparation of graft, and star (co)polymers and other useful topologies.
  • Useful alcohols of the formula R 5 (ZH) p include aliphatic and aromatic monoalcohols and polyols.
  • Useful monoalcohols include methanol, ethanol, octanol, decanol, and phenol.
  • the polyols useful in the present invention include aliphatic or aromatic polyols having 1 to 30 carbon atoms, at least two hydroxyl groups.
  • Example of useful polyols include ethylene glycol, propylene glycol, butanediol, 1,3-pentanediol, 2,2-oxydiethanol, hexanediol, poly(pentyleneadipate glycol), poly(tetramethylene ether glycol), poly(ethylene glycol), poly(caprolactone diol), poly(1,2-butylene oxide glycol), trimethylol ethane, trimethylol propane, trimethylol aminomethane, ethylene glycol, 2-butene-1,4-diol, pentaerythritol, dipentaerythritol, and tripentaerythritol.
  • polyol also includes derivatives of the above-described polyols such as the reaction product of the polyol with di- or poly-isocyanate, or di- or poly-carboxylic acid, the molar ratio of polyol to -NCO, or -COOH being 1 to 1.
  • Useful amines of the formula R 5 (ZH) p include aliphatic and aromatic monoamines and polyamines. Any primary or secondary amine may be employed, although primary amines are preferred to secondary amines.
  • Useful monoamines include, for example, methyl-ethyl-, propyl-, hexyl-, octyl, dodecyl-, dimethyl-, and aniline.
  • the term "di-, or polyamines,” refers to organic compounds containing at least two non-tertiary amine groups. Aliphatic, aromatic, cycloaliphatic, and oligomeric di- and polyamines all are considered useful in the practice of the invention.
  • di- or polyamines Representative of the classes of useful di- or polyamines are 4,4'-methylene dianiline, 3,9-bis(3-aminopropyl)-2,4,8,10-tetraoxaspiro[5,5]undecane, and polyoxyethylenediamine.
  • Many di- and polyamines, such as those just named, are available commercially, for example, those available from Huntsman Chemical, Houston, TX.
  • Preferred di- or polyamines include aliphatic diamines or aliphatic di- or polyamines and more specifically compounds with two primary amino groups, such as ethylene diamine, hexamethylene diamine, dodecanediamine, and the like.
  • Useful thiols of the formula R 5 (ZH) p include aliphatic and aromatic monothiols and polythiols.
  • Useful alkyl thiols include methyl, ethyl and butyl thiol, as well as 2-mercaptoethanol, 3-mercapto-1,2-propanediol, 4-mercaptobutanol, mercaptoundecanol, 2-mercaptoethylamine, 2,3-dimercaptopropanol, 3-mercaptopropyltrimethoxysilane, 2-chloroethanethiol, 2-amino-3-mercaptopropionic acid, dodecyl mercaptan, thiophenol, 2-mercaptoethyl ether, and pentaerythritol tetrathioglycolate.
  • Useful soluble, high molecular weight thiols include polyethylene glycol di(2-mercaptoacetate), LP-3 tm resins supplied by Morton Thiokol Inc. (Trenton, NJ), and Permapol P3 tm resins supplied by Products Research & Chemical Corp. (Glendale, CA.) and compounds such as the adduct of 2-mercaptoethylamine and caprolactam.
  • the invention provides multifunctional initiators as shown in Scheme III, whereby an azlactone initiator of Formula I is ring-opened by a multireactive or multifunctional compound of the formula R 5 (ZH) p , where p is at least 2.
  • Such multifunctional initiators may be used to produce branched, star and graft (co)polymers and other topologies. It will also be apparent that such (co)polymers may also be prepared by first polymerizing a monomer using the initiator of Formula I, to produce polymers having an azlactone group at one terminal end, and then subsequently reacting the polymers with a polyfunctional compound of the formula R 5 (ZH) p , where p is at least 2.
  • the repeat unit of the oligomeric initiators is not shown in Scheme III, it will be appreciated that the -ZH groups of a multifunctional compound R 5 (ZH) p may react with the multiple, pendent azlactone groups on the same oligomer, or the azlactone groups on different oligomers to form a crosslinked composition. Additionally it will be appreciated that the multiple R 5 groups depicted in Formula II may be the same R 5 group whose multiple ZH groups react with adjacent azlactone groups on the same oligomer.
  • the multifunctional initiators may comprise a solid support having a plurality of initiator moieties on the surface thereof.
  • Such initiator-functionalized supports have the general structure (corresponding to Formula II): wherein X, R 1 , ON(R 2 ) 2 , R 3 , R 4 , X, Z, q, p and n are as previously described for Formula II and SS is a solid support corresponding to R 5 .
  • SS is a solid support corresponding to R 5 .
  • the solid support material includes functional groups to which initiator molecules of Formula I can be covalently attached for effecting polymerization on the solid surface.
  • Useful functional groups include hydroxyl, amino and thiol functional groups corresponding to -ZH.
  • the solid support material (SS) can be organic or inorganic. It can be in the form of a solid, gel, glass, etc. It can be in the form of a plurality of particles (e.g., beads, pellets, or microspheres), fibers, a membrane (e.g., sheet or film), a disc, a ring, a tube, or a rod, for example. Preferably, it is in the form of a plurality of particles or a membrane. It can be swellable or non-swellable and porous or nonporous.
  • the support material (SS) can be a polymeric material that can be used in conventional solid phase synthesis. It is chosen such that it is generally insoluble in the solvents or other components used in synthetic reactions that occur during the course of solid phase synthesis. Examples of useable pre-existing support materials are described in G.B. Fields et al., Int. J. Peptide Protein Res., 35, 161 (1990 ) and G.B. Fields et al., in Synthetic Peptides: A User's Guide, G.A. Grant, Ed., pages 77-183, W.H. Freeman and Co., New York, NY (1992 ).
  • the support material is in the form of an organic polymeric material, such as polystyrenes, polyalkylenes, nylons, polysulfones, polyacrylates, polycarbonates, polyesters, polyimides, polyurethanes, etc. and having hydroxyl, amino or thiol substituents on the surface.
  • an organic polymeric material such as polystyrenes, polyalkylenes, nylons, polysulfones, polyacrylates, polycarbonates, polyesters, polyimides, polyurethanes, etc. and having hydroxyl, amino or thiol substituents on the surface.
  • a preferred support material is polystyrene.
  • the initiators may be used for controlled radical polymerization of ethylenically unsaturated monomers.
  • ethylenically unsaturated monomers that may be polymerized include (meth)acrylates such as ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, isooctyl (meth)acrylate and other alkyl (meth)acrylates; also functionalized (meth)acrylates including glycidyl (meth)acrylate, trimethoxysilyl propyl (meth)acrylate, allyl (meth)acrylate, hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, dialkylaminoalkyl (meth)acrylates; fluoroalkyl (meth)acrylates; (meth)acrylic acid, fumaric acid (and esters), itaconic acid (and esters), maleic anhydride; styrene
  • the amounts and relative proportions of initiator is that effective to conduct nitroxide-mediated radical polymerization (NMP).
  • concentration and amounts is generally determined by the desired molecular weight of the resulting polymer. Accordingly, the amount of initiator can be selected such that the initiator concentration is from 10 -4 M to 1M, preferably 10 -3 to 10 -1 M.
  • the initiator can be present in a molar ratio of from 10 -4 :1 to 10 -1 :1, preferably from 10 -3 :1 to 5x10 -2 :1, relative to monomer.
  • the present polymerization may be conducted in bulk or in a solvent.
  • Solvents preferably organic, can be used to assist in the dissolution of the initiator and the polymerizable monomers, and as a processing aid.
  • solvents are not reactive with the azlactone group. It may be advantageous to prepare a concentrated solution of the initiator in a small amount of solvent to simplify the preparation of the polymerizable composition.
  • Suitable solvents include ethers such as diethyl ether, ethyl propyl ether, dipropyl ether, methyl t-butyl ether, di-t-butyl ether, glyme (dimethoxyethane), diethylene glycol dimethyl ether; cyclic ethers such as tetrahydrofuran and dioxane; alkanes; cycloalkanes; aromatic hydrocarbon solvents such as benzene, toluene, o-xylene, m-xylene, p-xylene; halogenated hydrocarbon solvents; acetonitrile; lactones such as butyrolactone, and valerolactones; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclopentanone, and cyclohexanone; sulfones such as tetramethylene sulfone,
  • the polymerization reaction may be controlled by matching the reactivity of the nitroxide groups in the initiator with the monomer, and by matching the energetics of bond breaking and bond forming in dormant species, e.g., dormant polymer chains and transition metal species. Matching the reactivities of the initiator with the monomer depends to some degree on the radical stabilizing effects of the substituents. Such matching of substituents on the initiator and monomer typically provides a beneficial balance of the relative reactivities of the initiator and monomer.
  • Polymerizing may be conducted at a temperature of from 20 to 200°C, preferably from 100 to 160°C and most preferably from 100 to 140°C, although the temperature is dependent on the reactivity of the specific organonitroxide used.
  • the reaction should be conducted for a length of time sufficient to convert at least 10% (preferably at least 50%, more preferably at least 75% and most preferably at least 90%) of the monomer to polymer.
  • the reaction time will be from several minutes to 5 days, preferably from 30 minutes to 3 days, and most preferably from 1 to 24 hours.
  • Polymerizing may be conducted at a pressure of from 0.1 to 100 atmospheres, preferably from 1 to 50 atmospheres and most preferably at ambient pressure (although the pressure may not be measurable directly if conducted in a sealed vessel).
  • An inert gas such as nitrogen or argon may be used.
  • a "one-pot" synthesis may be used whereby the azlactone initiator is prepared according either Scheme I or II, and then the monomer(s) is added.
  • the initiator is generated at a first temperature that is lower than that required to effect polymerization of the monomer(s), then the temperature is raised.
  • the initiator is prepared at a temperature ranging from 20 to 100°C, the monomer(s) added, and the temperature raised to 100 to 200°C.
  • the initiator may also be prepared in the presence of monomer(s) at a first temperature that is sufficient to effect the preparation of the initiator, but too low to effect polymerization of the monomer(s), and then the temperature is raised to effect polymerization of the monomer(s).
  • a conventional free-radical initiator may be added as an accelerant to the polymerizable mixture.
  • the (co)polymers obtained by the method of the invention may be described as telechelic (co)polymers comprising polymerized units of one or more free radically (co)polymerizable monomers (as previously described), a first terminal group selected from the group derived from ON(R 2 ) 2 and a second azlactone terminal group derived from the initiator of Formulas I or II:
  • Such (co)polymers have the general formula Az-(M 1 ) x (M 2 ) x (M 3 ) x ...(M ⁇ ) x -ON(R 2 ) 2 ,
  • the polymer product retains the functional group "ON(R 2 ) 2 " at a first terminal end of the polymer to initiate a further polymerization or may be used for further functionalization.
  • the polymer product further comprises either the azlactone moiety or the ring-opened azlactone moiety of the initiator at a second terminal end, which may be further reacted or functionalized as desired. Because the two terminal moieties have different functionality and reactivity, each terminus may be independently functionalized.
  • the second terminal group "Az” will comprise the residue of the azlactone group of the formula: where R 1 , R 3 , R 4 , Q, X, n, q and m are as previously defined for Formula I.
  • the second terminal group "Az” will comprise the ring-opened residue of the azlactone group: where R 1 , R 3 , R 4 , R 5 , Z, Q, X, n, q and m are as previously defined for Formula II.
  • R 5 groups depicted for Formula VI may be derived from the same molecule or different molecules of R 5 (ZH) p .
  • the terminal "-ON(R 2 ) 2 " group may be functionalized independently from the terminal "Az" group.
  • R 2 contains a reactive group such as a hydroxyl group
  • the reactive group may be reacted with an electrophile such as a carboxylic acid, carboxylic anhydride, or carboxylic acid chloride to produce a carboxylic ester.
  • an electrophile such as a carboxylic acid, carboxylic anhydride, or carboxylic acid chloride
  • the present invention encompasses a novel process for preparing random, block, multi-block, star, gradient, random hyperbranched and dendritic copolymers, as well as graft or "comb" copolymers. Each of these different types of copolymers will be described hereunder.
  • NMP is a "living" or “controlled” polymerization, it may be initiated and terminated as desired.
  • a second monomer may then be added to form a second block on the growing polymer chain in a second polymerizing step. Additional polymerizations with the same or different monomer(s) may be performed to prepare multi-block copolymers.
  • the subsequent polymer steps may use the same initiator system as in the first step of the polymerization, or another may be chosen to reflect or "match" the different reactivity of the subsequent monomers.
  • blocks may be prepared in essentially any order.
  • a multi-block copolymer in which a polyacrylonitrile or a poly(meth)acrylate block is prepared first, then a styrene or butadiene block is attached thereto, etc.
  • a linking group is not necessary to join the different blocks of the present block copolymer.
  • the product polymer having a terminal "ON(R 2 ) 2 " group acts as the new initiator for the further polymerization of the additional monomer.
  • the novel initiators provide a reactive group "Az" at a terminal end of the polymer
  • linking groups may be used to join two polymer blocks.
  • a polymer prepared in accord with the present invention, and having an azlactone group of Formula V at one terminus may be reacted with a second polymer block having a nucleophilic terminal group.
  • Statistical copolymers may be produced using the initiators of the present invention. Such copolymers may use 2 or more monomers in a range of about 0-100% by weight of each of the monomers used. The product copolymer will be a function of the molar amounts of the monomers used and the relative reactivity of the monomers.
  • the present invention also provides graft or "comb" copolymers.
  • a first (co)polymer having pendent nucleophilic functional groups, such hydroxy-, amino- or thio- groups, etc. is provided.
  • An example of a useful (co)polymers include hydroxyethyl acrylate (co)polymers.
  • the reactive functional groups of the first (co)polymer is reacted with the azlactone initiators of Formula I to provide a (co)polymer having pendent, ring-opened initiator moieties, the reaction product having the structure of Formula II, where R 5 is the residue of the first (co)polymer.
  • This product (co)polymer may then be used as an initiator to polymerize the previously-described monomers to produce a comb (co)polymer.
  • the first (co)polymer may be reacted with a telechelic (co)polymer of the invention, whereby the reactive "Az" terminal group reacts with the pendent reactive group of the first (co)polymer.
  • Gradient or tapered copolymers can be produced using NMP by controlling the proportion of two or more monomers being added. For example, one can prepare a first block or an oligomer of a first monomer, then a mixture of the first monomer and a second distinct monomer can be added in proportions of from, for example, 1:1 to 9:1 of first monomer to second monomer. After conversion of all monomer(s) is complete, sequential additions of first monomer-second monomers mixtures can provide subsequent "blocks" in which the proportions of first monomer to second monomer vary.
  • the invention provides copolymers obtained from two or more radically (co)polymerizable monomers wherein the copolymer has a composition that varies along the length of the polymer chain from azlactone terminus to opposite terminus based on the relative reactivity ratios of the monomers and instantaneous concentrations of the monomers during polymerization
  • VDM 1.1 g, 0.0979mol
  • monoTEMPO 0.2g, 0.0077mol
  • toluene 1.3g
  • the mixture was stirred and flushed with nitrogen gas for a period of 30 minutes after which it was heated to 110°C with an oil bath for a period of 4 hours.
  • Example 2 To the reaction mixture of Example 2 there was added a solution of styrene (10g, 0.096mol) in toluene (10g) that had been deoxygenated by bubbling nitrogen gas through it for 30 minutes. This mixture was stirred at 130°C for 16 hours after which time is was analyzed by gel permeation chromatography. The reaction yielded a polymer with a M n of 11,200 and a polydispersity of 1.24. The theoretical M n was 14,400. To qualitatively demonstrate the presence of the azlactone groups on the resulting polymer, a tri-functional amine (tris(2-aminoethyl)amine) was added to the polymer. This reaction produced an insoluble cross-linked polymer, thus demonstrating that the polystyrene was connected to the oligomeric azlactone initiator and that the azlactone groups on the chain-ends were reactive towards mild nucleophiles.
  • styrene 10g, 0.096mol
  • Screw-cap glass vials were charged with styrene and AzTEMPO in amounts as given in the table. Toluene was added in the calculated amount to give solutions that were 25wt% solids. The solutions were deoxygenated by bubbling nitrogen gas through them for 30 minutes. The vials were then capped and were heated to 130°C in an oil bath for 16 hours, after which time the vials were opened and the products were analyzed by gel permeation chromatography. The results are shown in the table below.
  • Example 4 Styrene 0.997g (0.0096mol) 1.019g (0.0098mol) AzTEMPO 0.026g (0.000088mol) 0.0047g (0.000018mol) Calculated Mn (100% conversion) 11350g/mol 64250g/mol Actual Mn 2790g/mol 23900g/mol PDI 1.76 2.05 Monomer converted 43% 62%
  • a three-arm star polymer of styrene was prepared using the initiator of Example 6.
  • a 30 weight percent solution of the initiator in toluene (0.0253g; 0.000024mol of initiator) was mixed with styrene.
  • the solution was deoxygenated by bubbling nitrogen gas through it for 30 minutes and was then heated to 130°C. After 24 hours the solution was allowed to cool to room temperature and the polymer was precipitated from the solution by the addition of methanol.
  • the polymer was analyzed by gel permeation chromatography and was found to have Mn of 16,256 g/mol and a PDI of 1.18. It was determined gravimetrically that 40% of the monomer was converted in the reaction.
  • a three-arm star polymer of styrene was prepared by reaction of a linear styrene polymer with a trifunctional amine.
  • AzTEMPO (0.196g; 0.00066mol) and styrene (13.696g; 0.132mol) were mixed in toluene (13.9g).
  • the solution was deoxygenated by bubbling nitrogen gas through it for 30 minutes and was then heated to 130°C. After 16 hours the solution was allowed to cool to room temperature and the resultant polymer was analyzed by gel permeation chromatography. The number average molecular weight was found to be 20,611g/mol.

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Claims (13)

  1. Initiateur de polymérisation radicalaire contrôlée comprenant :
    un composé de formule :
    Figure imgb0024
    dans laquelle
    X est un H, un groupement alkyle, un groupement cycloalkyle, un groupement hétérocyclique, un groupement arényle, un groupement aryle, un nitrile, un groupement acyle ou le résidu d'un initiateur de radicaux libres ;
    R1 est H, un groupement alkyle, un groupement cycloalkyle, un groupement hétérocyclique, un groupement arényle ou un groupement aryle ;
    ON(R2)2 est le résidu d'un organonitroxyde ;
    R3 et R4 sont choisis chacun indépendamment parmi un alkyle, un groupement cycloalkyle, un groupement aryle, un groupement arényle, ou R3 et R4 pris ensemble avec le carbone auquel ils sont liés forment un cycle carbocyclique ;
    Q est un groupement lieur choisi parmi une liaison covalente, (-CH2-)o, -CO-O-(-CH2-)o-, -CO-O-(CH2CH2O)o-, -CO-NR6-(-CH2)o-, -CO-S-(-CH2-)o-, où o est 1 à 12, et R6 est H, un groupement alkyle, un groupement cycloalkyle, un groupement arényle, un groupement hétérocyclique ou un groupement aryle ;
    chaque n est 0 ou 1 ;
    m est 0 à 20 ;
    q est 0 ou 1 ;
    Z est O, S ou NR6, où R6 est H, un groupement alkyle, un groupement cycloalkyle, un groupement arényle, un groupement hétérocyclique ou un groupement aryle ;
    R5 est un motif organique ou minéral et a une valence de p.
  2. Initiateur monomère selon la revendication 1, caractérisé en ce que m est 0, q est 0, et X est un H, un groupement alkyle, un groupement cycloalkyle, un groupement hétérocyclique, un groupement arényle, un groupement aryle, un nitrile ou un groupement acyle.
  3. Initiateur oligomère selon la revendication 1, caractérisé en ce que m est 1 à 20, X est le résidu d'un initiateur de radicaux libres, et q est 1.
  4. Initiateur de la revendication 1, caractérisé en ce que ledit groupement R5Z est issu d'un composé de formule R5(ZH)p dans laquelle R5 est un groupement minéral ou organique de valence p, et - ZH est choisi parmi OH, SH ou NHR6, où R6 est H, un groupement alkyle, un groupement cycloalkyle, un groupement arényle, un groupement hétérocyclique ou un groupement aryle.
  5. Initiateur de la revendication 1, caractérisé en ce que ledit groupement R5 comprend un motif non polymère aliphatique, cycloaliphatique, aromatique ou aromatique alkyl-substitué ayant de 1 à 30 atomes de carbone.
  6. Initiateur de la revendication 1, caractérisé en ce que ledit groupement R5 comprend un polymère polyoxyalkylène, polyester, polyoléfine, polyacrylate ou polysiloxane ayant des groupements -ZH réactifs pendants ou terminaux.
  7. Méthode de polymérisation par addition d'un ou plusieurs monomères oléfiniquement insaturés comprenant la polymérisation par addition d'un ou plusieurs monomères oléfiniquement insaturés en utilisant l'initiateur de l'une quelconque des revendications 1 à 6.
  8. Méthode selon la revendication 7, comprenant en outre une deuxième étape de polymérisation mettant en oeuvre un ou plusieurs monomères oléfiniquement insaturés supplémentaires.
  9. (Co)polymère téléchélique comprenant des motifs polymérisés d'un ou plusieurs monomères (co)polymérisables par des radicaux libres,
    un premier groupement terminal azlactone à cycle ouvert ; et
    un deuxième groupement terminal qui est le résidu d'un organonitroxyde.
  10. Copolymère de la revendication 9, comprenant deux séquences de motifs ou plus obtenues à partir de monomères (co)polymérisables par des radicaux libres, caractérisé en ce que le copolymère séquencé a un résidu azlactone à une première extrémité terminale et le résidu d'un organonitroxyde à la deuxième extrémité terminale.
  11. (Co)polymère de la revendication 9, comprenant des motifs polymérisés obtenus à partir de deux monomères ou plus (co)polymérisables par voie radicalaire, caractérisé en ce que le copolymère a une composition qui varie le long de la longueur de la chaîne polymère de l'extrémité azlactone à l'extrémité opposée sur la base des rapports de réactivité relative des monomères et des concentrations instantanées des monomères pendant la polymérisation.
  12. (Co)polymère de la revendication 9, ayant la structure

            Az-(M1)x-ON(R2)2,

    dans laquelle
    ON(R2)2 est le résidu d'un organonitroxyde ;
    M1 est un motif monomère issu d'un motif monomère (co)polymérisable par voie radicalaire ayant un degré de polymérisation moyen x, et
    Az est un groupement azlactone à cycle ouvert de formule :
    Figure imgb0025
    dans laquelle X est un H, un groupement alkyle, un groupement cycloalkyle, un groupement hétérocyclique, un groupement arényle, un groupement aryle, un nitrile, un groupement acyle ou le résidu d'un initiateur de radicaux libres ;
    R1 est H, un groupement alkyle, un groupement cycloalkyle, un groupement hétérocyclique, un groupement arényle ou un groupement aryle ;
    R3 et R4 sont choisis chacun indépendamment parmi un alkyle, un groupement cycloalkyle, un groupement aryle, un groupement arényle, ou R3 et R4 pris ensemble avec le carbone auquel ils sont liés forment un cycle carbocyclique ;
    Q est un groupement lieur choisi parmi une liaison covalente, (-CH2-)o, -CO-O-(-CH2-)o-, -CO-O-(CH2CH2O)o-, -CO-NR6-(-CH2)o-, -CO-S-(-CH2-)o-, où o est 1 à 12, et R6 est H, un groupement alkyle, un groupement cycloalkyle, un groupement arényle, un groupement hétérocyclique ou un groupement aryle ;
    chaque n est 0 ou 1 ;
    m est 0 à 20 ;
    q est 0 ou 1 ;
    Z est O, S ou NR6, où R6 est H, un groupement alkyle, un groupement cycloalkyle, un groupement arényle, un groupement hétérocyclique ou un groupement aryle ;
    R5 est un motif organique ou minéral et a une valence de p.
  13. (Co)polymère de la revendication 9, ayant la structure

            Az-(M1)x(M2)x-(M3)x...(MΩ)x-ON(R2)2,

    dans laquelle
    ON(R2)2 est le résidu d'un organonitroxyde ;
    M1 à MΩ sont chacun des séquences polymères de motifs monomères issues de motifs monomères (co)polymérisables par voie radicalaire ayant un degré de polymérisation moyen x,
    chaque x est indépendant, et
    Az est un groupement azlactone à cycle ouvert de formule :
    Figure imgb0026
    dans laquelle X est un H, un groupement alkyle, un groupement cycloalkyle, un groupement hétérocyclique, un groupement arényle, un groupement aryle, un nitrile, un groupement acyle ou le résidu d'un initiateur de radicaux libres ;
    R1 est H, un groupement alkyle, un groupement cycloalkyle, un groupement hétérocyclique, un groupement arényle ou un groupement aryle ;
    R3 et R4 sont choisis chacun indépendamment parmi un alkyle, un groupement cycloalkyle, un groupement aryle, un groupement arényle, ou R3 et R4 pris ensemble avec le carbone auquel ils sont liés forment un cycle carbocyclique ;
    Q est un groupement lieur choisi parmi une liaison covalente, (-CH2-)o, -CO-O-(-CH2-)o-, -CO-O-(CH2CH2O)o-, -CO-NR6-(-CH2)o-, -CO-S-(-CH2-)o-, où o est 1 à 12, et R6 est H, un groupement alkyle, un groupement cycloalkyle, un groupement arényle, un groupement hétérocyclique ou un groupement aryle ;
    chaque n est 0 ou 1 ;
    m est 0 à 20 ;
    q est 0 ou 1 ;
    Z est O, S ou NR6, où R6 est H, un groupement alkyle, un groupement cycloalkyle, un groupement arényle, un groupement hétérocyclique ou un groupement aryle ;
    R5 est un motif organique ou minéral et a une valence de p.
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US6908952B2 (en) * 2003-03-21 2005-06-21 3M Innovative Properties Company Ring-opened azlactone photoiniferters for radical polymerization
US6747104B1 (en) * 2003-03-21 2004-06-08 3M Innovative Properties Company Azlactone photoiniferters for radical polymerization
US6753391B1 (en) * 2003-05-05 2004-06-22 3M Innovative Properties Company Ring-opened azlactone chain transfer agents for radical polymerization
EP1749032B1 (fr) * 2004-05-27 2008-02-27 Ciba Specialty Chemicals Holding Inc. Alcoxyamines contenant un groupe polymerisable par voie radicalaire
FR2884517B1 (fr) * 2005-04-19 2007-05-25 Arkema Sa Procede de preparation d'alcoxamines par photolyse de dithiocarbamates
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US20130035452A1 (en) * 2010-05-19 2013-02-07 Evonik Goldschmidt Gmbh Polysiloxane block copolymers and use thereof in cosmetic formulations

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ATE446328T1 (de) 2009-11-15
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